The water in a Norwegian fjord goes up and down twice a day with the tide. If a dam was built across the entrance of the fjord it would be possible to generate electrical energy from the flowing water. How much energy would be generated per day?
Surface area of fjord = 4.2 x 105 m2
Tidal difference = 1.2 m
density of water = 1100 kgm-3
efficiency of system 20%
